Scuba diving training, start to finish
Scuba diving training, explained one level at a time
Scuba diving training follows a clear path: a beginner course that certifies you to dive, then optional steps that add depth, skills and responsibility. These guides explain what each certification involves, what it asks of you and how to pick a school, so you arrive at your first lesson knowing what to expect.
- Beginner courses from age 10
- Recognized around the world
- No experience needed to start
- 18 m60 ftOpen Water DiverYour first full certification
- 30 m100 ftAdvanced Open WaterDeep and navigation dives, plus three more
- Skillsany depthRescue DiverPrevent and manage problems
- ProworkDivemaster and instructorGuide certified divers, then teach
Start here
What scuba diving training looks like for a beginner
Every major training agency teaches beginners in the same three stages. The order matters: each one builds on the last.
Knowledge development
You learn how pressure affects your body and your air, how the equipment works, and how to plan a dive. Most people now do this part online at home before they meet an instructor.
Confined water practice
In a pool or a calm, shallow spot, you breathe underwater for the first time and practice the core skills: clearing your mask, recovering your regulator, sharing air and controlling your buoyancy.
Open water dives
You repeat those skills on real dives in the ocean, a lake or a quarry, with your instructor beside you. After the final dive and a short review, you are a certified diver.
The full beginner course is explained step by step in our guide to Open Water certification, including how long it takes and what you need before you sign up.
The certification path
From first breath underwater to teaching others
Scuba certifications are not one test you pass once. They are a ladder. The first rung, Open Water Diver, lets you dive with a buddy without a professional, within the limits of your training. After that, each course is optional. Many people dive happily for years on an Open Water card.
Others keep going. Advanced Open Water adds deeper dives and navigation. Rescue Diver teaches you to spot and handle problems, and many divers say it is the course that made them confident. Divemaster and instructor training turn diving into work.
Our overview of scuba certification levels lays out every step in order, with the age, experience and depth limits for each.
Open Water Diver
The full beginner certification.
Advanced Open Water
Five guided dives, including deep and navigation.
Rescue Diver
Self-rescue and helping other divers.
Divemaster and instructor
Lead dives, assist classes, then teach.
Before you book
Plan your scuba diving training
A good course depends more on where you learn and who teaches you than on the logo on the card. These guides help you decide.
PADI vs SSI vs NAUI
How the three largest agencies differ, and why the choice matters less than you might think.
Choosing a dive school
The questions to ask, the warning signs to watch for, and whether to learn at home or on holiday.
What certification costs
What goes into the price of a course, the extras that catch people out, and how to compare quotes.
Medical and fitness
The medical questionnaire, the swim test, and which conditions need a doctor's sign-off.
Skills that keep you safe
Training is about habits, not just a card
The point of scuba diving training is to give you habits that hold up when something unexpected happens: checking your buddy's gear before every dive, equalizing early, ascending slowly, keeping an eye on your air and never holding your breath.
Those habits are what we focus on in our guide to core scuba skills and safety. It is useful before a course, and just as useful as a refresher if you have not been in the water for a while.
The one rule every course teaches first: breathe continuously and never hold your breath on scuba. Air in your lungs expands as you rise, and holding it during an ascent can injure your lungs.
Everything else in training builds on that rule.
Quick answers
Common questions about scuba diving training
Do I need to be a strong swimmer to learn to dive?
You need to be comfortable in the water, not fast. Beginner courses include a basic watermanship check, typically a continuous swim of about 200 metres or yards with no time limit, plus about ten minutes of floating or treading water.
How long does it take to get certified?
Most Open Water courses take three to four days of in-person training. Doing the theory online first can shorten your time at the dive center, and some schools spread the course over several weekends instead.
Does my certification expire?
No. Recreational certifications from the major agencies do not expire. If you have not dived in a while, most dive centers will suggest a short refresher session before your next dive.
Will a dive shop abroad accept my card?
Certifications from the major agencies are widely recognized by dive operators around the world. Bring your card or the digital version in the agency's app, and your logbook if you have one.
More questions are answered in our scuba training FAQ, and practical tips are on the scuba training blog.
Ready to take your first breath underwater?
Read what the beginner course covers, what to bring and what each day looks like.